The multiphoton ionization spectra of ethylamine and dimethylamine are presented in the 400-470nm region, with resonance excitation to 3s Rydberg state. The MPI fragmentation patterns of two C2H7N isomers are readily ...The multiphoton ionization spectra of ethylamine and dimethylamine are presented in the 400-470nm region, with resonance excitation to 3s Rydberg state. The MPI fragmentation patterns of two C2H7N isomers are readily distinguished . For ethylamine, the most prevalent fragmentation is β-Cleavage, while for dimethylamine that is H atom ejection.展开更多
The multiphoton ionization (MPI) of diethylamine is first reported in this paper. Atime-of-flight mass spectrometer was used in the experiment under collision-free condition. MPImass spectra were measured in the regio...The multiphoton ionization (MPI) of diethylamine is first reported in this paper. Atime-of-flight mass spectrometer was used in the experiment under collision-free condition. MPImass spectra were measured in the region of 464 ～486 nm using a dye laser and at double fre-quency of a Nd:YAG laser. Molecular ion was created through resonance enhanced multiphotonionization (REMPI) via Rydberg states. Fragment, ion distribution was formed through “lladderswitching” process. The experimentai demonstration of the process is reported for the first timeby the discussion of dependence of ion relative, abundance on laser wavelength and energy. Thecompetition bet,ween further up-pumping and fragmentation of Parent ion also exists, and higherlaser intensity favors the former.展开更多
文摘The multiphoton ionization spectra of ethylamine and dimethylamine are presented in the 400-470nm region, with resonance excitation to 3s Rydberg state. The MPI fragmentation patterns of two C2H7N isomers are readily distinguished . For ethylamine, the most prevalent fragmentation is β-Cleavage, while for dimethylamine that is H atom ejection.
文摘The multiphoton ionization (MPI) of diethylamine is first reported in this paper. Atime-of-flight mass spectrometer was used in the experiment under collision-free condition. MPImass spectra were measured in the region of 464 ～486 nm using a dye laser and at double fre-quency of a Nd:YAG laser. Molecular ion was created through resonance enhanced multiphotonionization (REMPI) via Rydberg states. Fragment, ion distribution was formed through “lladderswitching” process. The experimentai demonstration of the process is reported for the first timeby the discussion of dependence of ion relative, abundance on laser wavelength and energy. Thecompetition bet,ween further up-pumping and fragmentation of Parent ion also exists, and higherlaser intensity favors the former.
